一，案例一

1.1、错误描述

 五月 30, 2014 11:33:57 下午 freemarker.log.JDK14LoggerFactory$JDK14Logger error
 严重: Template processing error: "Expected hash. flag evaluated instead to freemarker.template.TemplateBooleanModel$2 on line 21, column 8 in type.ftl."

 Expected hash. flag evaluated instead to freemarker.template.TemplateBooleanModel$2 on line 21, column 8 in type.ftl.
 The problematic instruction:
 ----------
 ==> ${flag.color?string} [on line 21, column 6 in type.ftl]
 ----------

 Java backtrace for programmers:
 ----------
 freemarker.template.TemplateException: Expected hash. flag evaluated instead to freemarker.template.TemplateBooleanModel$2 on line 21, column 8 in type.ftl.
     at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:136)
     at freemarker.core.Dot._getAsTemplateModel(Dot.java:78)
     at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
     at freemarker.core.BuiltIn$stringBI._getAsTemplateModel(BuiltIn.java:408)
     at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
     at freemarker.core.Expression.getStringValue(Expression.java:93)
     at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.MixedContent.accept(MixedContent.java:92)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.Environment.process(Environment.java:199)
     at freemarker.template.Template.process(Template.java:259)
     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
     at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:172)
     at com.you.test.freemarker.FreemarkerTest.testDataType(FreemarkerTest.java:159)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

 Expected hash. flag evaluated instead to freemarker.template.TemplateBooleanModel$2 on line 21, column 8 in type.ftl.
 The problematic instruction:
 ----------
 ==> ${flag.color?string} [on line 21, column 6 in type.ftl]
 ----------

 Java backtrace for programmers:
 ----------
 freemarker.template.TemplateException: Expected hash. flag evaluated instead to freemarker.template.TemplateBooleanModel$2 on line 21, column 8 in type.ftl.
     at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:136)
     at freemarker.core.Dot._getAsTemplateModel(Dot.java:78)
     at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
     at freemarker.core.BuiltIn$stringBI._getAsTemplateModel(BuiltIn.java:408)
     at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
     at freemarker.core.Expression.getStringValue(Expression.java:93)
     at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.MixedContent.accept(MixedContent.java:92)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.Environment.process(Environment.java:199)
     at freemarker.template.Template.process(Template.java:259)
     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
     at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:172)
     at com.you.test.freemarker.FreemarkerTest.testDataType(FreemarkerTest.java:159)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
 <html>
   <head>
     <meta http-equiv="content-type" content="text/html; charset=UTF-8">
     <title>freemarker基本数据类型</title>

   </head>

   <body>
           张三丰

      123,456

      true

 Expected hash. flag evaluated instead to freemarker.template.TemplateBooleanModel$2 on line 21, column 8 in type.ftl.
 The problematic instruction:
 ----------
 ==> ${flag.color?string} [on line 21, column 6 in type.ftl]
 ----------

 Java backtrace for programmers:
 ----------
 freemarker.template.TemplateException: Expected hash. flag evaluated instead to freemarker.template.TemplateBooleanModel$2 on line 21, column 8 in type.ftl.
     at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:136)
     at freemarker.core.Dot._getAsTemplateModel(Dot.java:78)
     at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
     at freemarker.core.BuiltIn$stringBI._getAsTemplateModel(BuiltIn.java:408)
     at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
     at freemarker.core.Expression.getStringValue(Expression.java:93)
     at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.MixedContent.accept(MixedContent.java:92)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.Environment.process(Environment.java:199)
     at freemarker.template.Template.process(Template.java:259)
     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
     at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:172)
     at com.you.test.freemarker.FreemarkerTest.testDataType(FreemarkerTest.java:159)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

1.2、错误原因

 <#--定义布尔值-->
 <#assign flag = true/>
 ${flag?string}
 ${flag.color?string}

因为flag已经定义为true，再次定义会报错

1.3、解决办法

修改变量名，将flag修改为num

 ${(num.color)???string}

结果：false

二，案例二

2.1、错误描述

 六月 04, 2014 10:31:47 下午 freemarker.log.JDK14LoggerFactory$JDK14Logger error
 严重: Template processing error: "Expected number, sequence, or string. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 11, column 12 in map.ftl."

 Expected number, sequence, or string. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 11, column 12 in map.ftl.
 The problematic instruction:
 ----------
 ==> ${maps[3]} [on line 11, column 10 in map.ftl]
 ----------

 Java backtrace for programmers:
 ----------
 freemarker.template.TemplateException: Expected number, sequence, or string. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 11, column 12 in map.ftl.
     at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:136)
     at freemarker.core.DynamicKeyName.dealWithNumericalKey(DynamicKeyName.java:125)
     at freemarker.core.DynamicKeyName._getAsTemplateModel(DynamicKeyName.java:90)
     at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
     at freemarker.core.Expression.getStringValue(Expression.java:93)
     at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.MixedContent.accept(MixedContent.java:92)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.Environment.process(Environment.java:199)
     at freemarker.template.Template.process(Template.java:259)
     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
     at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:210)
     at com.you.test.freemarker.FreemarkerTest.testMap(FreemarkerTest.java:197)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

 <html>
   <head>
     <meta http-equiv="content-type" content="text/html; charset=UTF-8">
     <title>freemarker</title>

   </head>

   <body>

 Expected number, sequence, or string. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 11, column 12 in map.ftl.
 The problematic instruction:
 ----------
 ==> ${maps[3]} [on line 11, column 10 in map.ftl]
 ----------

 Java backtrace for programmers:
 ----------
 freemarker.template.TemplateException: Expected number, sequence, or string. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 11, column 12 in map.ftl.
     at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:136)
     at freemarker.core.DynamicKeyName.dealWithNumericalKey(DynamicKeyName.java:125)
     at freemarker.core.DynamicKeyName._getAsTemplateModel(DynamicKeyName.java:90)
     at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
     at freemarker.core.Expression.getStringValue(Expression.java:93)
     at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.MixedContent.accept(MixedContent.java:92)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.Environment.process(Environment.java:199)
     at freemarker.template.Template.process(Template.java:259)
     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
     at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:210)
     at com.you.test.freemarker.FreemarkerTest.testMap(FreemarkerTest.java:197)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

 Expected number, sequence, or string. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 11, column 12 in map.ftl.
 The problematic instruction:
 ----------
 ==> ${maps[3]} [on line 11, column 10 in map.ftl]
 ----------

 Java backtrace for programmers:
 ----------
 freemarker.template.TemplateException: Expected number, sequence, or string. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 11, column 12 in map.ftl.
     at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:136)
     at freemarker.core.DynamicKeyName.dealWithNumericalKey(DynamicKeyName.java:125)
     at freemarker.core.DynamicKeyName._getAsTemplateModel(DynamicKeyName.java:90)
     at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
     at freemarker.core.Expression.getStringValue(Expression.java:93)
     at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.MixedContent.accept(MixedContent.java:92)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.Environment.process(Environment.java:199)
     at freemarker.template.Template.process(Template.java:259)
     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
     at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:210)
     at com.you.test.freemarker.FreemarkerTest.testMap(FreemarkerTest.java:197)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

2.2、错误原因

 <#--freemarker HashMap取值-->
 <#assign maps={"1":"张三丰","2":"李思思","3":"张三强","4":"王五"}/>
 ${maps[3]}

map取值时是要取序列、数字、字符串

2.3,解决办法

${maps["3"]}

三，案例三

3.1，错误描述

 <html>
   <head>
     <meta http-equiv="content-type" content="text/html; charset=UTF-8">
     <title>freemarker处理哈希表的内建函数</title>

   </head>

   <body>
           张三强

 Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl.
 The problematic instruction:
 ----------
 ==> list maps as map [on line 13, column 10 in map.ftl]
 ----------

 Java backtrace for programmers:
 ----------
 freemarker.template.TemplateException: Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl.
     at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:136)
     at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:190)
     at freemarker.core.Environment.visit(Environment.java:428)
     at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.MixedContent.accept(MixedContent.java:92)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.Environment.process(Environment.java:199)
     at freemarker.template.Template.process(Template.java:259)
     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
     at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:210)
     at com.you.test.freemarker.FreemarkerTest.testMap(FreemarkerTest.java:197)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
 六月 04, 2014 10:52:14 下午 freemarker.log.JDK14LoggerFactory$JDK14Logger error
 严重: Template processing error: "Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl."

 Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl.
 The problematic instruction:
 ----------
 ==> list maps as map [on line 13, column 10 in map.ftl]
 ----------

 Java backtrace for programmers:
 ----------
 freemarker.template.TemplateException: Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl.
     at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:136)
     at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:190)
     at freemarker.core.Environment.visit(Environment.java:428)
     at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.MixedContent.accept(MixedContent.java:92)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.Environment.process(Environment.java:199)
     at freemarker.template.Template.process(Template.java:259)
     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
     at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:210)
     at com.you.test.freemarker.FreemarkerTest.testMap(FreemarkerTest.java:197)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

 Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl.
 The problematic instruction:
 ----------
 ==> list maps as map [on line 13, column 10 in map.ftl]
 ----------

 Java backtrace for programmers:
 ----------
 freemarker.template.TemplateException: Expected collection or sequence. maps evaluated instead to freemarker.core.HashLiteral$SequenceHash on line 13, column 17 in map.ftl.
     at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:136)
     at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:190)
     at freemarker.core.Environment.visit(Environment.java:428)
     at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.MixedContent.accept(MixedContent.java:92)
     at freemarker.core.Environment.visit(Environment.java:221)
     at freemarker.core.Environment.process(Environment.java:199)
     at freemarker.template.Template.process(Template.java:259)
     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
     at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:210)
     at com.you.test.freemarker.FreemarkerTest.testMap(FreemarkerTest.java:197)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

3.2，错误原因

maps不是一个序列，不能用list遍历map

  <#--freemarker HashMap取值-->
 <#assign maps={"1":"张三丰","2":"李思思","3":"张三强","4":"王五"}>
 ${maps["3"]}

 <#list maps as map>
  ${map}
 </#list>

3.3、解决办法

先获取map中的key值，再通过key值序列遍历map

 <#--freemarker HashMap取值-->
      <#assign maps={"1":"张三丰","2":"李思思","3":"张三强","4":"王五"}>
      ${maps["3"]}

      <#assign keys=maps?keys>
      <#list keys as key>
         ${key}----${maps[key]}
      </#list>

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